#include<iostream>
using std::cout;
using std::endl;
using std::cin;

namespace Myspace
{
    extern int add(int ,int );
    extern double add(int ,double );
    extern double add(double ,int );
    extern int add(int ,int,int );
}
int main()
{
    cout<<Myspace::add(1,2)<<endl;
    cout<<Myspace::add(1.2,2)<<endl;
    cout<<Myspace::add(1,2.5)<<endl;
    cout<<Myspace::add(1,2,3)<<endl;
}
    
